What is the time difference between Sydney and Chatham Islands?

Chatham Islands is 2 hours 45 minutes ahead of Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Chatham Islands from Sydney?

Between 10:00–15:15 in Sydney, which is 12:45–18:00 in Chatham Islands. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

Does Chatham Islands observe daylight saving time?

Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.

If it is midday in Sydney, what time is it in Chatham Islands?

It is 14:45 in Chatham Islands, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Sydney and Chatham Islands use?

Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Sydney time to Chatham Islands time

Right now Chatham Islands runs 2 hours 45 minutes ahead of Sydney. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

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Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Sydney, across for Chatham Islands.

Sydney	Chatham Islands
00:00	02:45
01:00	03:45
02:00	04:45
03:00	05:45
04:00	06:45
05:00	07:45
06:00	08:45
07:00	09:45
08:00	10:45
09:00	11:45
10:00	12:45
11:00	13:45
12:00	14:45
13:00	15:45
14:00	16:45
15:00	17:45
16:00	18:45
17:00	19:45
18:00	20:45
19:00	21:45
20:00	22:45
21:00	23:45
22:00	00:45next day
23:00	01:45next day

Daylight saving time

Sydney and Chatham Islands both observe daylight saving. Where their change dates differ, so does the gap between them for the weeks in between.

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

Chatham Islands

Observes daylight saving time

Standard: UTC+12:45
Daylight: UTC+13:45
Next change: 2026-09-27 +60m

When you can actually talk

You have 5 hours 15 minutes of shared working time: 10:00–15:15 in Sydney, which is 12:45–18:00 in Chatham Islands.

Sydney 10:00–15:15Chatham Islands 12:45–18:00
Sydney 09:00–10:00Chatham Islands 11:45–12:45

Reference

The zone identifiers and offsets behind everything above.

	Sydney	Chatham Islands
IANA zone	Australia/Sydney	Pacific/Chatham
Abbreviation	AEST	CHAST
Standard offset	UTC+10	UTC+12:45
Daylight offset	UTC+11	UTC+13:45
Clock changes this year	2	2
Country	Australia	New Zealand

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Sydney and Chatham Islands?: Chatham Islands is 2 hours 45 minutes ahead of Sydney. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Chatham Islands from Sydney?: Between 10:00–15:15 in Sydney, which is 12:45–18:00 in Chatham Islands. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
Does Chatham Islands observe daylight saving time?: Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.
If it is midday in Sydney, what time is it in Chatham Islands?: It is 14:45 in Chatham Islands, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Sydney and Chatham Islands use?: Sydney uses Australia/Sydney, currently UTC+10 (AEST), and Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.